(CNN) — An Idaho man has been charged with assaulting a minor after he allegedly uttered a racial slur and slapped a 2-year-old boy who cried on a Delta plane as it began the final descent into Atlanta, court papers show.

Reached by phone Friday, Joe Rickey Hundley of Hayden, Idaho, declined to comment to CNN and referred inquiries to his attorney. The attorney couldn’t be immediately reached for comment Friday.

The boy’s mother, Jessica Bennett, 33, of Minnesota told the FBI that she and her son were seated in row 28, seat B, on February 8 on Delta Flight 721 that originated in Minneapolis, according to an FBI agent’s affidavit filed in U.S. District Court in Atlanta this week.

The boy began crying because of the altitude change, and his mother tried to soothe him, court papers said.

Then Hundley, who was seated next to the mother and son, allegedly told her to “shut that (‘N word’) baby up,” according to court documents.

Hundley then turned around and slapped the 2-year-old in the face with an open hand, which caused the child to scream even louder, the affidavit said.

The boy suffered a scratch below his right eye, court papers said.

Other passengers on the plane assisted Bennett, and one of them heard the slur and witnessed the alleged assault, the affidavit said. The plane landed at Atlanta Hartsfield Jackson International.

The charge of simple assault on someone under age 16 carries a prison sentence of one year, court papers said.